Problem with Genesys Studio

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When I open any block and edit the JSP code in it, close it and try to edit again - my changes are lost. Studio Version 7.5.0.31.
Can some one help. System is Windows XP with Service Pack 3. I found a solution in the genesys support site

[url=http://solutionsearch.genesyslab.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=1176262011&sliceId=1&docTypeID=DT_SOLUTION_1_1&dialogID=3220567&stateId=0%200%203218792]http://solutionsearch.genesyslab.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=1176262011&sliceId=1&docTypeID=DT_SOLUTION_1_1&dialogID=3220567&stateId=0%200%203218792[/url]

which is to uninstall windows security patch KB918118, but I can't find that particular patch may be 'coz my system's got SP 3..

Thanks in Advance..

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Okay.. I downloaded an older version of riched20.dll into the directory where my Studio.exe is and it works now.
Attached is the zipped dll file.

Thanks.